EFFECT OF HEMA ON BONDING TO DENTIN
EFFECT OF HEMA ON BONDING TO DENTIN
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DOI：
10.1016/0109-5641(92)90067-m
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发表时间：
1992-03-01
期刊：
影响因子：
5
通讯作者：
TAKARADA, K
中科院分区：
文献类型：
--
作者：
NAKABAYASHI, N;TAKARADA, K
本研究探讨了在应用粘合剂树脂之前用甲基丙烯酸2-羟乙酯（HEMA）治疗牙本质的有效性。粘接树脂为5% 4-甲基丙烯酰氧乙基偏苯三酸酐（4-Meta）的甲基丙烯酸甲酯（MMA）溶液与聚甲基丙烯酸甲酯（MMA）粉末的混合物，以三丁基硼烷（TBB）为引发剂进行聚合。用600粒度Carbimet纸盘研磨牛牙本质样品，并用10%柠檬酸/3%氯化铁水溶液（10-3）或10%柠檬酸水溶液（10-0）脱矿。用HEMA处理牛牙本质样品，可以改善粘结强度，并且粘结强度的改善取决于HEMA应用的时间。扫描电子显微镜（SEM）检查显示，在接受10-3预处理的标本中，形成了树脂增强牙本质的过渡区，称为“混合”层。粘合剂树脂浸渍暴露的胶原纤维束，并与其缠结以产生“混合物”，这对于实现高拉伸粘合强度至关重要。用10-0预处理的样品不容易形成“混合”层。然而，如果在10-0预处理之后施用HEMA，则在SEM上显示“混杂物”，并且粘结强度增加到13 MPa。10-3中的铁离子有效地改善了牙本质基质的扩散性，如HEMA。本研究表明，HEMA应用于牙本质基质增强了单体扩散和与牙本质组分的缠结，并促进了“混合”层的形成。
The present study investigated the effectiveness of treating dentin with 2-hydroxyethyl methacrylate (HEMA) prior to application of an adhesive resin. The adhesive resin was 5% 4-methacryloxyethyl trimellitate anhydride (4-META) in methyl methacrylate (MMA) combined with poly-MMA powder, Polymerization of this resin was initiated by tri-n-butyl borane (TBB). Bovine dentin samples were ground with 600-grit Carbimet paper discs, and demineralized with either an aqueous solution of 10% citric acid/3% ferric chloride (10-3) or an aqueous solution of 10% citric acid (10-0). Improved bond strengths were achieved with HEMA treatment of bovine dentin samples, and improvement of bond strengths was dependent upon the time period of HEMA application. Scanning electron microscope (SEM) examination revealed the formation of a transitional zone of resin-reinforced dentin, termed the "hybrid" layer, in those specimens receiving 10-3 pre-treatment. The adhesive resin impregnated the exposed collagen bundles with which it entangled to create the "hybrid", essential in the attainment of high tensile bond strengths. Specimens pre-treated with 10-0 did not readily form "hybrid" layers. However, if HEMA application followed the 10-0 pretreatment, "hybrids" were demonstrated on SEM, and bond strength increased to 13 MPa. The ferric ions in the 10-3 effectively improved the diffusivity of dentinal substrates, as did HEMA. This study indicates that HEMA applied to dentinal substrates enhances monomer diffusion and entanglement with dentinal components, and facilitates the formation of a "hybrid" layer.